What is the composition and working principle of central air conditioning?

The central air conditioning system is mainly composed of refrigerator, cooling water circulation system, chilled water circulation system, fan coil system and cooling tower.

The working principle of central air conditioning system is as follows:

The refrigerator compresses the refrigerant into a liquid state through a compressor, and then sends it to an evaporator for heat exchange with the chilled water, thereby refrigerating the chilled water. The chilled water is sent to the cooling coils at the air outlet of each fan by a refrigeration pump and blown by the fans to achieve the purpose of refrigeration. The evaporated refrigerant releases heat into gas in the condenser, and the cooling pump sends the cooling water into the cooling tower, which is sprayed and cooled by the fan of the water tower, and exchanges heat with the atmosphere to dissipate heat into the atmosphere.

Extended data water-cooled central air conditioner includes compressor, condenser, throttling device and evaporator. Refrigerant circulates in the above four parts in turn. The high-temperature and high-pressure refrigerant (refrigerant) from the compressor flows through the condenser, which brings heat to the cooling tower and discharges it through the cooling water system. Refrigerant continues to flow through the throttling device to become low-temperature and low-pressure liquid, and flows through the evaporator to absorb heat and be compressed.

The working principle of fan-coil air conditioning system is to make indoor air circulate continuously with the help of fan-coil to cool or heat it through the coil, so as to maintain the required indoor temperature and certain relative humidity. The cold water or hot water used by the coil is supplied by the central cold source and heat source.

Compared with the centralized system, the fan-coil air conditioning system has no large air duct, only water pipes and smaller fresh air ducts. It has the advantages of convenient arrangement and installation, small occupation of building space and good independent adjustment. It is widely used in comfortable air conditioners with low temperature and humidity accuracy, many rooms and small rooms, which need independent control.

Resources Central Air Conditioning (Air Conditioning System) Baidu Encyclopedia